The invention provides an electromagnetic solenoid device for starter of motor, and the electromagnetic solenoid device transmits a torque generated by an electric motor to a pinion which meshes with a ring gear of an engine to start the engine. The electromagnetic solenoid device includes a first solenoid that produces a magnetic attraction to move a pinion gear toward the ring gear, and a second solenoid which is arranged according to the first solenoid. The second solenoid is working to as to produce a magnetic attaction to move a piston together with a moving contact, in order to perform a physical contact with a fixed contact, thereby excitation current is supplied to the electric motor. The moving contact is disposed around an outer periphery of the piston and is held by a holder to be rotatble relateive to the pistion. The moving contact is placed away from a rotational stopper by a gap. When the moving contact performs a physical contact with the rotational stopper, the rotational stopper stops the movement of the contact from rotating. A friction reduction device is disposed in at least between the moving contact and the pistion and between the moving contact and the holder so as to be rotatable relative to the piston. The friction reduction device operates to reduce torque of the picton to the movable contact, whereby the conversion of the torque of the moving contact is suppressed so as to push the moving contact at a time when the movable contact abuts the rotational stopper.